Part of the Yanmar Repair Manuals.
Set the intake and exhaust valve lash on an L48EE and the number you want is 0.15 mm, printed in the Service Standards table on page 19 of this manual. It is Yanmar's own service manual, publication M9961-H11310, for the L48EE, L70EE and L100EE industrial diesel engines, including the L48EE-D(E), L70EE-D(E) and L100EE-D(E) variants: 136 pages, English, delivered as a PDF download.
Every day the engine sits in pieces is a day whatever it powers stands idle, and this book covers the whole job: disassembly and reassembly procedures, service standards with wear limits for valves, piston, connecting rod, crankshaft and main bearing, a full tightening torque table, fuel injection pump and governor service, injection timing adjustment, air bleeding, and an electrical section with wiring diagrams plus troubleshooting charts.
Buy it once and it is yours: keep the file, print the torque pages for the bench, and reassemble to the clearances Yanmar intended.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Revision History | 3-4 | Document Name, Product Name, Revision No., Revision Date, Reason for Revision, Revision Outline |
| Safety & Precautions | 8-12 | Danger, Warning, Caution, Service Shop, Working Wear, Tools to Be Used, Use of Genuine Parts, Oil and Grease, Electrical Parts |
| Product Outline & Specifications | 13-15 | Usage, Exhaust Gas Regulations, Engine Identification, Fuel Injection Nozzle, Cylinder Head, Piston, Rocker Arm, Fuel Injection Pump, Cam Shaft, Emission Standards Warranty, Specifications |
| Sectional Views | 16-18 | Cross Sectional View, Longitudinal Section View, Plane View |
| Service Standards & Tightening Torques | 19-29 | Intake/Exhaust Valve Seats, Intake/Exhaust Valves & Valve Guides, Valve Spring, Piston, Connecting Rod, Crankshaft and Main Bearing, Valve Rocker Arm Support, Flywheel End Nuts, Crankcase Cover Bolts, Head Stud Bolts, Connecting Rod Bolts & Nuts |
| Maintenance Schedule & Service Tools | 30-35 | Change Engine Oil, Clean Air Cleaner Element, Check Injection Nozzle, Adjust Valve Clearance, Replace Piston Ring, Tools Meters and Instruments, Service Accessories |
| Disassembly and Reassembly | 36-48 | Engine, Recoil Starter |
| Engine Component Overhaul | 50-65 | Piston and Piston Pin, Piston Rings, Connecting Rod, Crank Pin Metals, Crankshaft, Main Bearing, Flywheel, Camshaft and Tappet, Timing Gears, Crankcase Cover, Cylinder Sleeve and Cylinder Block, Lubricating Oil Pump |
| Fuel System, Speed Control & Adjustment | 66-77 | Fuel Injection Pump, Fuel Injection Valve, Fuel Filter, Governor Spring, Speed Control Device, Regulator Lever, Fuel Injection Timing, Valve Clearance Adjustment, Bleeding Air From Fuel System |
| Electrical System | 78-105 | Wiring Diagram, Starter Motor, Generator, Regulator, Rectifier, Battery |
| Troubleshooting | 106-125 | No Fuel Injection Sound, Low Compression Pressure, Leak in Crankcase, Failure of Starter Motor, Abnormal Exhaust Color, Unexpected Reverse Rotation at Start, Racing, Uneven Rotation, Sudden Stops During Operation |
| Test Run | 126-128 | Before Starting, Starting, Operation, Stopping |
| Repair Procedures & Special Tools | 129-135 | Helical Inserting Part for Repair, Size of Helical Inserting Part, Procedure for Using Helical Inset Part, Special Tools |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Air cleaner element (replacement interval) | every 500 hours | p. 30 |
| FO injection nozzle (STD) tightening torque | 6.9-9.8 Nm | p. 4 |
| FO injection nozzle (Stamper/Rammer) tightening torque | 9.8-11.8 Nm | p. 4 |
| Intake and exhaust valve clearance | 0.15 ± 0.05 mm | p. 19 |
| L48EE | ||
| Rocker arm support tightening torque | 10 Nm | p. 4 |
| FO injection nozzle (Stamper application) tightening torque | 9.8 Nm | p. 4 |
| Flywheel tightening torque | 138-147 Nm | p. 4 |
| Cylinder head tightening torque | 29.4-33.4 Nm | p. 4 |
| Connecting rod tightening torque | 22.5-27.5 Nm | p. 4 |
| L48EE-L70EE | ||
| Flywheel end nuts tightening torque | 11770-12750 N·cm | p. 29 |
| L100EE | ||
| Cylinder head nuts tightening torque | 5296-5688 N·cm | p. 29 |
